Extended Data Fig. 2: Synthesis of ultrathin freestanding BFO films.
From: Freestanding crystalline oxide perovskites down to the monolayer limit
a–c, Cross-sectional HAADF images (a), SAED patterns (b), and plan-view HAADF images (c) of ultrathin freestanding BFO films of various unit-cell thicknesses (four, three, two and one) below the reported 2D limit. Scale bars, 2 nm (a); 2 nm−1 (b); and 5 nm (c). All BFO films were suspended on holey carbon grids. As the one-unit-cell-thick freestanding film is extremely sensitive to the electron beam, it can survive only at low-dose SAED measurements.
